、______Aireoっ 发表于 2013-7-22 13:06:17

ISDN

1. 综合数字业务网(ISDN)

  综合数字业务网(ISDN)由数字电话和数据传输服务两部分组成,一般由电话局提供这种服务。ISDN的基本速率接口(BRI)服务提供2个B信道和1个D信道(2B+D)。BRI的B信道速率为64Kbps,用于传输用户数据。D信道的速率为16Kbps,主要传输控制信号。在北美和日本,ISDN的主速率接口(PRI)提供23个B信道和1个D信道,总速率可达1.544Mbps,其中D信道速率为64Kbps。而在欧洲、澳大利亚等国家,ISDN的PRI提供30个B信道和1个64Kbps D信道,总速率可达2.048Mbps。我国电话局所提供ISDN PRI为30B+D。

  2. 基本命令

  任务 命令
  设置ISDN交换类型 isdn switch-type switch-type1

  接口设置 interface bri 0

  设置PPP封装 encapsulation ppp

  设置协议地址与电话号码的映射 dialer map protocol next-hop-address

  启动PPP多连接 ppp multilink

  设置启动另一个B通道的阈值 dialer load-threshold load

  显示ISDN有关信息 show isdn {active | history | memory | services | status | timers}

  注:1.交换机类型如下表,国内交换机一般为basic-net3。

  按区域分关键字 交换机类型

  Australia
  basic-ts013 Australian TS013 switches
  Europe
  basic-1tr6 German 1TR6 ISDN switches
  basic-nwnet3 Norway NET3 switches (phase 1)
  basic-net3 NET3 ISDN switches (UK, Denmark, and other nations); covers the Euro-ISDN E-DSS1 signalling system
  primary-net5 NET5 switches (UK and Europe)
  vn2 French VN2 ISDN switches
  vn3 French VN3 ISDN switches
  Japan
  ntt Japanese NTT ISDN switches
  primary-ntt Japanese ISDN PRI switches
  North America
  basic-5ess AT&T basic rate switches
  basic-dms100 NT DMS-100 basic rate switches
  basic-ni1 National ISDN-1 switches
  primary-4ess AT&T 4ESS switch type for the U.S. (ISDN PRI only)
  primary-5ess AT&T 5ESS switch type for the U.S. (ISDN PRI only)
  primary-dms100 NT DMS-100 switch type for the U.S. (ISDN PRI only)
  New Zealand
  basic-nznet3 New Zealand Net3 switches
  3. ISDN实现DDR(dial-on-demand routing)实例:
  设置如下:
  Router1:
  hostname router1
  user router2 password cisco
  !
  isdn switch-type basic-net3
  !
  interface bri 0
  ip address 192.200.10.1 255.255.255.0
  encapsulation ppp
  dialer map ip 192.200.10.2 name router2 572
  dialer load-threshold 80
  ppp multilink
  dialer-group 1
  ppp authentication chap
  !
  dialer-list 1 protocol ip permit
  !

  Router2:
  hostname router2
  user router1 password cisco
  !
  isdn switch-type basic-net3
  !
  interface bri 0
  ip address 192.200.10.2 255.255.255.0
  encapsulation ppp
  dialer map ip 192.200.10.1 name router1 571
  dialer load-threshold 80
  ppp multilink
  dialer-group 1
  ppp authentication chap
  !
  dialer-list 1 protocol ip permit
  !


页: [1]
查看完整版本: ISDN